immobilized ionic liquid on the zeolite: its characterization and catalytic activity in the synthesis of coumarins via pechmann reaction

In this work, in the first step, the 1-methyl-3-(3-trimethoxysilylpropyl) imidazolium chloride ([mtmspim]cl) is immobilized on hy and nay zeolites as an acidic catalyst. the synthesized catalysts were well characterized by different methods such as ftir, tga, xrd, bet, sem, edx and icp. the characterizations of catalysts indeed show the ionic liquid supported on amine-functionalized zeolites. also, the result shows the micro-/mesoporous structure for catalysts which have been emerged as an important class of catalytic materials. the micro-/mesocatalyst ([mtmspim]cl@zeolite) was used as an acidic catalyst to synthesize coumarins via pechmann reaction in solvent-free condition. the effect of different factors such as catalyst amount, solvent and time was investigated. finally, catalyst can be easily separated and reused for the next reactions at least for five runs without any significant changes in yield and structure of the catalyst. comparison of modified zeolite with [mtmspim]cl shows higher yield and selectivity and mild condition related to other works.